Packing quantity: 5pcs hydraulic hinges Specifications: insertion and insertion, half stack, full stack Advantages: damping hydraulic hinge, provide cushioning performance, use liquid, thickened solid booster arm, even opening and closing strength, even load bearing support force. Silent cushioning: hydraulic copper cylinder, cushioning hinges, cushioning reduces noise. Material: 304 stainless steel, long-term use, not easy to rust, high temperature processing, color stability., Manufacturer: Shun Yingtong